1212020109961 has 2 divisors, whose sum is σ = 1212020109962. Its totient is φ = 1212020109960.

The previous prime is 1212020109947. The next prime is 1212020110031. The reversal of 1212020109961 is 1699010202121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 863447949961 + 348572160000 = 929219^2 + 590400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212020109961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212020109901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606010054980 + 606010054981.

It is an arithmetic number, because the mean of its divisors is an integer number (606010054981).

Almost surely, 2^{1212020109961} is an apocalyptic number.

It is an amenable number.

1212020109961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212020109961 is an equidigital number, since it uses as much as digits as its factorization.

1212020109961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The spelling of 1212020109961 in words is "one trillion, two hundred twelve billion, twenty million, one hundred nine thousand, nine hundred sixty-one".